California Planting Calendar by Region

California is a collection of climates. A planting plan for the foggy coast, the hot Central Valley, the Sierra foothills and the low desert must each start from local conditions.

Key points

Start by naming your region and microclimate, not the state.
Expect wet winters and dry summers in much of California.
Keep both frost cover and shade cloth available where needed.
Use local station data and your own records.

Why does California need a regional calendar?

California includes cool coastal strips, hot interior valleys, foothills, high mountains and low deserts. Frost risk, heat, fog and rainfall differ from one area to the next, sometimes within a few miles. A single statewide date table would mislead nearly everyone.

Instead, think in regions and microclimates. Identify your general region first, then your local station and your own site, and ask your county University of California Cooperative Extension advisor for local guidance.

How do coastal and inland areas differ?

Coastal areas are cooled by ocean air and fog, which keeps summers mild and frosts light or rare in many places. That favors cool-season crops year-round, but warm-season crops can struggle to ripen in cool, foggy summers. Inland valleys are hotter and drier in summer and cooler in winter, with a distinct frost period in many areas.

As a result, coastal growers may plant lettuce nearly year-round, while inland growers often pause leafy crops in the hottest months and favor heat-loving crops in summer.

Coast: cool summers, mild winters, fog
Inland valleys: hot summers, winter frost possible
Foothills and mountains: elevation shortens the season
Low desert: hot summers, mild winters

What is the Mediterranean rhythm of the year?

Much of California has a Mediterranean pattern: wet winters and dry summers. Cool-season crops often grow through the rainy months, and warm-season crops are planted after frost danger passes and grown on irrigation in the dry season. Many gardeners plant in fall for winter growth, a rhythm that differs from most of the country.

Because summers are dry, water supply and scheduling come first. Drip irrigation and mulch conserve water, and local restrictions during drought years vary by community and district, so check before planning.

How do you handle frost and heat in the same year?

Even where winters are mild, cold snaps can damage tender crops, and citrus and subtropicals are especially sensitive. At the other end, heat waves can burn foliage, drop blossoms and stop fruit set. Keep frost cloth and shade cloth both on hand, depending on your region.

Look at long-term weather station data from the National Weather Service and NOAA for your area. The USDA Plant Hardiness Zone Map describes average winter minimums and does not tell you planting dates, so use it for perennial selection rather than annual scheduling.

How do you plan for the desert and the mountains?

In low desert areas, the main growing season runs through the cooler months, and summers can be too hot for many crops. In mountain areas, the situation reverses: short seasons, cold nights and late frost limit what can be grown, so crop choice leans toward quick maturing varieties and season extension.

In both cases, ask your local extension advisor for crop lists and timing, because the range between desert, foothill and mountain sites is very large.

How do you create your own California calendar?

For example, if you farm on the central coast where frost is light, you might plan year-round plantings of cool-season crops and set warm-season crops later to match warm nights. If you farm inland, you might place cool-season crops in fall and early spring and warm-season crops after your last spring frost. These are worked examples of the method, not date recommendations.

Write down your own frost events, heat spells, planting dates and results. Over a few seasons you will see how your microclimate differs from the nearest station and how to adjust accordingly.

What mistakes cost California growers the most?

The first mistake is applying a statewide or out-of-region date to your site. The second is planting warm-season crops in a cool, foggy spot and expecting them to ripen like they would inland. The third is underestimating the effect of hot spells on young transplants.

Another mistake is ignoring water. California water rules vary by district and can change in drought, and irrigation plans should account for the dry season. Drip lines, mulch and soil moisture checks use water efficiently and reduce losses.

Growers should also recognize that wildfire, smoke and heat events affect timing in some years. Plan flexibility into the calendar, keep shade cloth and irrigation options ready, and check local advisories. A county extension advisor can help you adapt your plan to local conditions.

Match crop to your microclimate
Check local water rules
Protect transplants from heat and cold snaps

When to get local help: Your county University of California Cooperative Extension advisor or a certified crop adviser can give regional guidance.

Sources and further reading

Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.

More in Regional Calendars, Climate & Data

← Pacific Northwest Planting Calendar Desert Southwest Planting Calendar →